Locomotion in echinodermata, Biology

Locomotion in Echinodermata

Locomotion in echinoderms is accomplished through a unique canalicular system which is termed as the water-vascular system. This system is characteristic of echinoderms, in most of that it is quite well developed. It consists of a series of canals derived from the coelom. The canals consist of a fluid. Sea water has free access to the system via a perforated sieve plate called the madreporite on the aboral side of the animal. The fluid is much more like seawater but has a high content of potassium ions. Some proteins and several types of amoebocytes float in it. The structural organisation of the water-vascular system is chiefly the same in all echinoderms, though deviations from the basic plan occur. To study the components of the system, we might take the water-vascular system of the star-fish, as typical example. Its main component applicable from the point of view of locomotion consists of a pentagonal circumoral vessel that is termed as the ambulacral ring canal. From the ring canal are given off five radial vessels. Every radial canal extends up to the tip of the arm. It gives off a large number of side vessels along its course. Each side vessel leads into a tube-foot or podium, which is a hollow conical or cylindrical process with an ampulla and a terminal sucker. A Valve is present at the junction of lateral vessel with the tube-foot.

Posted Date: 2/4/2013 2:51:30 AM | Location : United States







Related Discussions:- Locomotion in echinodermata, Assignment Help, Ask Question on Locomotion in echinodermata, Get Answer, Expert's Help, Locomotion in echinodermata Discussions

Write discussion on Locomotion in echinodermata
Your posts are moderated
Related Questions
Q. Demonstration of tremendous diversity? A objective of taxonomy is the assemblage of knowledge gained. This is usually in the form of treatises useful to fellow scientists an

Consider an ecosystem consisting of a prey and a predator. If H is the density of prey, P is the density of predator, r is the intrinsic rate of prey population enhance and q is th

What is the rule for the pairing of nitrogen-containing bases in the DNA molecule? And in the RNA? The rule for the pairing of nitrogen-containing bases of the polynucleotide c

Nursing  Education   Computer-Assisted Instruction (CAI) is a valuable teaching aid for health care students, testing them with frequent quizzes to ensure that the material rea

A Molecule of DNA is 2.17 um long. The ends of the molecule become strongly ionixed: negative on one end, positive on the other. The helical molecule acts like a spring and compres

GENE INTERACTIONS (POST MENDELIAN GENETICS) Phenotypic expression of a gene may be altered by the influence of other genes. The modification of the normal phenotype of certain

The presence of advanced plaques of types IV and Va allows clinical symptoms to develop. Atherosclerosis is a biphasic disease; in the first stage, advanced plaques are generated b

Q. Why do diabetic patients often undergo dietary sugar restriction? What are the major complications of diabetes mellitus? Diabetic patients are frequently advised to ingest f

As coenzymes participate in a variety of functions, they can be classified broadly into two groups: i)  Hydrogen transferring  coenzymes, and ii)  Group transferring coenzym

Ensure proper diet to Control Protein Energy Malnutrition? PEM is preventable. It is a disease of the poor and the ignorant that suffer from social inequalities. Therefore, a h